hey guys

just looking for some thoughts comparing JL 500.1 against Audison lrx 1.400.

looking at either to run a JL 12W3 dual 2ohm coils. i know the lrx can do 900w at 1ohm but thinking thats probably too much for the sub and in a small car (corolla hatch). box is gonna be bout 1.7cu ft sealed, but i might port it later at something pretty low - bout 20-25hz.

so thoughts, pros, cons. let em rip.

well... the LRx has more power on tap, so i'd go for that,
BUT the 500.1 does make 620WRMS which is more than enough for your application.
i think it will also be more efficient.
they are both around the same price from memory

[ December 11, 2002, 20:51: Message edited by: Mr_Bob ]

yeah they are both bout same price ~$900

and they both have similiar current draws - audison 60A fuse, and the guy wasn't sure bout JL but prob between 50A and 60A.

what if said they were both gonna run at 4ohm? that makes it roughly 500w vs 350w.

not sure if i would run the lrx at 1ohm due to heat concerns since the amp would be under passengers seat.

[ December 11, 2002, 20:54: Message edited by: PartyJase ]

the JL is a funny bugger,
it apparently puts out the same power regardless of impedance, well 4/2/1 anyway.
(that's what i hear)
so ~620WRMS
this is due to a regulated output stage methinks.

this should also help minimise frequency output, due to impedance rise

but as i'm not sure on the technical details behind this, i wouldn't like to assume it would fix those sorts of problems.

even though they may be fused simliarly i would expect the JL to be more efficient.
as i believe it's a class D and the LRX a class a/b

Well you have to way up your options....
In your situation i would most likely go the JL amp and you can still wire it either for a 4ohm or 1 ohm load and it will still give you the same amount of power...

Also remember the JL amp is most likely under rated so you will get more that 500watts out of it

hmm, difficult choice.

if you had in mind the occasional 'SPL' competition run, then i'd go with the audison. for daily use, run the sub as 4ohm, with 350WRMS on tap. that's heaps from a gutsy monobloc to make that sub boogy. and for SPL days, reconfigure it for 1ohm; burps won't make the amp heat up badly.

the purist will also vouch for the class AB amp for what that's worth.

IMO the JL would be the better daily amp, with more power on tap at 4ohm. it'll be more efficient, being class D, and not suck the power away from other components (ie: not cause as big voltage sags if driven hard).

hope this helps.

I personally would go for the JL. Its a beautiful little amp. At 4ohm, it's damping factor is >500... fantastic for running a sub... and i reckon the biggest selling point is that it is capable of outputting the full 500rms at input voltages from 11.5V-14V. This means that even if your battery/alternator isn't able to deliver a high voltage consistently, you'll still have plenty of power from your amp...

*Looks at own sig*
JL!!

Very happy with this gadget, the quite tightly regulated power supply means same strong grunt across a range of impedances and supply voltages, ALL Good in the "real world".

Also very big-time damping factor and extra-low distortion by Class D standards.
Hugely better control and cleaner sound than the Kicker ZR it replaced.

I'm not real big on the "get what I got" thing, but it really is very good, know a number of peeps with them and all very happy......

Hope that helps

really theres no chance of doing spl burps or nething like that, but a valid point raised nevertheless.

i thought tho that with the power supply being regulated you didn't get instances of amps making more power than supposed (like 620w instead of 500w)?

also anyone know of amps having problems after they've been sitting on demo boards? it hasn't been wired up but the guy said i could take the one cheaper, or wait 2-3 days for one to be brought in but would have to pay more.

Yup PartyJase your exactly right, the JL will pump out pretty much the same 500WRMS as specified due to the regulation factor.

Like Critter I too don't believe in the "get what I have" scenario, but I'd like to think I know a good amp when I hear one, and I personally love my JL, so much so that I'm going to get another one in the not too distant future along with two 10W6v2's. I can't recomed these amps highly enough, they wonderful little things, and great value for money in my opinion.

amps with stiffly regulated power supplies still retain the ability to provide big transient peaks; so it's not limited/capped at 500WRMS or whatever. what it does mean, in this case, is that the power on tap does not alter if the supply voltage varies or the speaker/sub impedence.

so what's not regulated is the normal amp power output in keeping with the music.

just imagine it as if the amp was supplied a constant voltage as if it was running via a 240V power supply. which is great, coz normally the power from the alt/batt fluctuates all the time.

demo board components usually make excellent value. ensure they provide a full warranty, and you're laughing; also check it for scratches and marks.

aside from that, it should have a had a very easy life, especially if it hasn't been hooked up at all! and the only times i'd be cautious is if it had (moving) parts that could wear out; amps don't really, but HUs and screens do.

good luck

Quick note:
The 620 watt rms figure Mr_Bob referred to came from an Auto Sound and Performance test......and yes a VERY similar number across all sorts of loads and supply voltages.

thanks for the info guys. cleared up a few questions i had well.
hopefully soon i'll be in the possession of it


oh another thing - anyone got a link for that magazine test?

[ December 12, 2002, 11:08: Message edited by: PartyJase ]

http://www.carsound.com/reviews/amps/jl_5001.html

On re-reading, the numbers are "almost" how I remembered them

damn!!!

600w resistive
733w peak!!! at 2ohms

those are some nice numbers.

thanks for the link as well.

[ December 13, 2002, 11:38: Message edited by: PartyJase ]

No wukkers
That's we are here for....

Tis a nice clean, strong thing

... And a clean understated appearance that looks fantastic.

well guys i picked the one up off the demo board at jb tonite. guy there did me a pretty good deal for it - even had to go talk to the manager bout it.

can't wait to get it hooked up now, just gotta finish my new box for a 12w3 and then she'll all be sweet!

awesome. let us know how it goes and post some pics!

hopefully i'll get it all done for the vic meet on sunday.
haven't got a dig camera to get any pics at the moment.

besides its gonna be hiding under my seat keeping it nice and warm so wont be able to see it. having a hatch isn't too great for making amp racks and having lots of room in the boot heh

You'll have to really flog it to get it even close to warm....but it can be done

Bah, go get a PPI 21400 lol, i'm waiting eagerly for it to arrive, i tell ya, when it does Well, i'm gonna run it into an 8 ohm mtx 150wrms sub See if it smokeesssssss
The jl's are supposed to be very nice, then again, the audison's are too, jl should be easier to fit tho, the audison is pretty long
Aaron

hehe
try and grab a video of it - would be worth a laugh

IMHO the JL amps are much better than the lrx series. Just a quickie on the 500.1 you'll find its a touch under A/B current draw and not as good as most D designs due to the way it makes its power.

Fair point Devour, the 500/1 is not as efficient as many other Class D's.

Waving said that, where with my ZR I had significant headlight dimming on Da Big Hits I get that no more even tho it is making more power and I am using it

So the efficiency is still usefully/in a practical way better than an A/B amp.

its got a 50A fuse so its not too bad.

installed it today... gave it a brief workout to make sure it was working. just gotta finish my 12w3 box before it gets to have any real fun